165555065 has 16 divisors (see below), whose sum is σ = 215040000. Its totient is φ = 121632192.

The previous prime is 165555043. The next prime is 165555067. The reversal of 165555065 is 560555561.

It is a cyclic number.

It is not a de Polignac number, because 165555065 - 2¹⁶ = 165489529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165555067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6536 + ... + 19334.

It is an arithmetic number, because the mean of its divisors is an integer number (13440000).

Almost surely, 2^165555065 is an apocalyptic number.

It is an amenable number.

165555065 is a deficient number, since it is larger than the sum of its proper divisors (49484935).

165555065 is a wasteful number, since it uses less digits than its factorization.

165555065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 165555065 is about 12866.8203142812. The cubic root of 165555065 is about 549.0950020453.

The spelling of 165555065 in words is "one hundred sixty-five million, five hundred fifty-five thousand, sixty-five".